Influence of air content on thermal degradation of poly(ethylene terephthalate)

IF 0.2 Q4 ENGINEERING, GEOLOGICAL Archives for Technical Sciences Pub Date : 2021-11-15 DOI:10.31648/ts.7069
W. Rejmer
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Abstract

Abstract: The aim of these research is to investigate the air content on aging of poly(ethylene terephthalate) (PET) preforms. Three air pressures were selected and in each pressure 5 samples were aged during 21 days in 80oC. Three samples were selected to cut and measure their density with the use of hydrostatic method. Sample mass, Young modulus and surface roughness were measured for each sample before and after aging and differences between those parameters were presented as results. The changes of parameters may lead to a conclusion that mechanism of polymeric chain oxidation is dominant during thermal aging of PET. However the aging is not the fastest in atmospheric pressure but in lower air contents. This effect may be caused by greater evaporation of small molecule degradation products and shifting of reaction equilibrium in the direction of further decomposition.
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空气含量对聚对苯二甲酸乙酯热降解的影响
摘要:本研究旨在探讨空气含量对聚对苯二甲酸乙酯(PET)预制体老化的影响。选择三种气压,在每种气压下,5个样品在80℃下老化21天。选取3个试样,采用流体静力法进行切割和密度测量。测定了老化前后样品的质量、杨氏模量和表面粗糙度,并给出了这些参数之间的差异。参数的变化表明PET热老化过程中高分子链氧化机制占主导地位。然而,在大气压力下,老化速度不是最快的,而是在空气含量较低的情况下。这种影响可能是由于小分子降解产物蒸发更大,反应平衡向进一步分解的方向转移。
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来源期刊
Archives for Technical Sciences
Archives for Technical Sciences ENGINEERING, GEOLOGICAL-
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